diff options
Diffstat (limited to 'arch/arm26/machine/dma.c')
| -rw-r--r-- | arch/arm26/machine/dma.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/arch/arm26/machine/dma.c b/arch/arm26/machine/dma.c new file mode 100644 index 0000000..cbc7c61 --- /dev/null +++ b/arch/arm26/machine/dma.c @@ -0,0 +1,215 @@ +/* + * linux/arch/arm26/kernel/dma.c + * + * Copyright (C) 1998-1999 Dave Gilbert / Russell King + * Copyright (C) 2003 Ian Molton + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * DMA functions specific to Archimedes and A5000 architecture + */ +#include <linux/config.h> +#include <linux/sched.h> +#include <linux/init.h> + +#include <asm/dma.h> +#include <asm/fiq.h> +#include <asm/irq.h> +#include <asm/io.h> +#include <asm/hardware.h> +#include <asm/mach-types.h> + +#define DPRINTK(x...) printk(KERN_DEBUG x) + +#if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE) + +extern unsigned char fdc1772_dma_read, fdc1772_dma_read_end; +extern unsigned char fdc1772_dma_write, fdc1772_dma_write_end; +extern void fdc1772_setupdma(unsigned int count,unsigned int addr); + +static void arc_floppy_data_enable_dma(dmach_t channel, dma_t *dma) +{ + DPRINTK("arc_floppy_data_enable_dma\n"); + + if (dma->using_sg) + BUG(); + + switch (dma->dma_mode) { + case DMA_MODE_READ: { /* read */ + unsigned long flags; + DPRINTK("enable_dma fdc1772 data read\n"); + local_save_flags_cli(flags); + clf(); + + memcpy ((void *)0x1c, (void *)&fdc1772_dma_read, + &fdc1772_dma_read_end - &fdc1772_dma_read); + fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */ + enable_fiq(FIQ_FLOPPYDATA); + local_irq_restore(flags); + } + break; + + case DMA_MODE_WRITE: { /* write */ + unsigned long flags; + DPRINTK("enable_dma fdc1772 data write\n"); + local_save_flags_cli(flags); + clf(); + memcpy ((void *)0x1c, (void *)&fdc1772_dma_write, + &fdc1772_dma_write_end - &fdc1772_dma_write); + fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */ + enable_fiq(FIQ_FLOPPYDATA); + + local_irq_restore(flags); + } + break; + default: + printk ("enable_dma: dma%d not initialised\n", channel); + } +} + +static int arc_floppy_data_get_dma_residue(dmach_t channel, dma_t *dma) +{ + extern unsigned int fdc1772_bytestogo; + + /* 10/1/1999 DAG - I presume its the number of bytes left? */ + return fdc1772_bytestogo; +} + +static void arc_floppy_cmdend_enable_dma(dmach_t channel, dma_t *dma) +{ + /* Need to build a branch at the FIQ address */ + extern void fdc1772_comendhandler(void); + unsigned long flags; + + DPRINTK("arc_floppy_cmdend_enable_dma\n"); + /*printk("enable_dma fdc1772 command end FIQ\n");*/ + save_flags(flags); + clf(); + + /* B fdc1772_comendhandler */ + *((unsigned int *)0x1c)=0xea000000 | + (((unsigned int)fdc1772_comendhandler-(0x1c+8))/4); + + local_irq_restore(flags); +} + +static int arc_floppy_cmdend_get_dma_residue(dmach_t channel, dma_t *dma) +{ + /* 10/1/1999 DAG - Presume whether there is an outstanding command? */ + extern unsigned int fdc1772_fdc_int_done; + + /* Explicit! If the int done is 0 then 1 int to go */ + return (fdc1772_fdc_int_done==0)?1:0; +} + +static void arc_disable_dma(dmach_t channel, dma_t *dma) +{ + disable_fiq(dma->dma_irq); +} + +static struct dma_ops arc_floppy_data_dma_ops = { + .type = "FIQDMA", + .enable = arc_floppy_data_enable_dma, + .disable = arc_disable_dma, + .residue = arc_floppy_data_get_dma_residue, +}; + +static struct dma_ops arc_floppy_cmdend_dma_ops = { + .type = "FIQCMD", + .enable = arc_floppy_cmdend_enable_dma, + .disable = arc_disable_dma, + .residue = arc_floppy_cmdend_get_dma_residue, +}; +#endif + +#ifdef CONFIG_ARCH_A5K +static struct fiq_handler fh = { + .name = "floppydata" +}; + +static int a5k_floppy_get_dma_residue(dmach_t channel, dma_t *dma) +{ + struct pt_regs regs; + get_fiq_regs(®s); + return regs.ARM_r9; +} + +static void a5k_floppy_enable_dma(dmach_t channel, dma_t *dma) +{ + struct pt_regs regs; + void *fiqhandler_start; + unsigned int fiqhandler_length; + extern void floppy_fiqsetup(unsigned long len, unsigned long addr, + unsigned long port); + + if (dma->using_sg) + BUG(); + + if (dma->dma_mode == DMA_MODE_READ) { + extern unsigned char floppy_fiqin_start, floppy_fiqin_end; + fiqhandler_start = &floppy_fiqin_start; + fiqhandler_length = &floppy_fiqin_end - &floppy_fiqin_start; + } else { + extern unsigned char floppy_fiqout_start, floppy_fiqout_end; + fiqhandler_start = &floppy_fiqout_start; + fiqhandler_length = &floppy_fiqout_end - &floppy_fiqout_start; + } + if (claim_fiq(&fh)) { + printk("floppydma: couldn't claim FIQ.\n"); + return; + } + memcpy((void *)0x1c, fiqhandler_start, fiqhandler_length); + regs.ARM_r9 = dma->buf.length; + regs.ARM_r10 = (unsigned long)dma->buf.__address; + regs.ARM_fp = FLOPPYDMA_BASE; + set_fiq_regs(®s); + enable_fiq(dma->dma_irq); +} + +static void a5k_floppy_disable_dma(dmach_t channel, dma_t *dma) +{ + disable_fiq(dma->dma_irq); + release_fiq(&fh); +} + +static struct dma_ops a5k_floppy_dma_ops = { + .type = "FIQDMA", + .enable = a5k_floppy_enable_dma, + .disable = a5k_floppy_disable_dma, + .residue = a5k_floppy_get_dma_residue, +}; +#endif + +/* + * This is virtual DMA - we don't need anything here + */ +static void sound_enable_disable_dma(dmach_t channel, dma_t *dma) +{ +} + +static struct dma_ops sound_dma_ops = { + .type = "VIRTUAL", + .enable = sound_enable_disable_dma, + .disable = sound_enable_disable_dma, +}; + +void __init arch_dma_init(dma_t *dma) +{ +#if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE) + if (machine_is_archimedes()) { + dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA; + dma[DMA_VIRTUAL_FLOPPY0].d_ops = &arc_floppy_data_dma_ops; + dma[DMA_VIRTUAL_FLOPPY1].dma_irq = 1; + dma[DMA_VIRTUAL_FLOPPY1].d_ops = &arc_floppy_cmdend_dma_ops; + } +#endif +#ifdef CONFIG_ARCH_A5K + if (machine_is_a5k()) { + dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA; + dma[DMA_VIRTUAL_FLOPPY0].d_ops = &a5k_floppy_dma_ops; + } +#endif + dma[DMA_VIRTUAL_SOUND].d_ops = &sound_dma_ops; +} |
